Pyrolysis gasoline orpygas is anaphtha-range product with higharomatics content.[1] It is a by-product of high temperature naphthacracking during ethylene andpropylene production, a high octane number mixture that contains aromatics from thearomatization reactions,olefins, and paraffins ranging from C5s to C12s. The mixture has its own CAS Number: 68477-58-7.
Pygas has high potential for use as a gasoline blending mixture and/or as a source of aromatics. Currently, pygas is generally used as a gasoline blending mixture due to its high octane number.[2] Depending on the feedstock used to produce theolefins,steam cracking can produce a benzene-rich liquid by-product calledpyrolysis gasoline. Pyrolysis gasoline can be blended with other hydrocarbons as a gasoline additive, or distilled (inBTX process) to separate it into its components, includingbenzene.
Raw pyrolysis gasoline (RPG, raw pygas) is rich inbenzene and is usually subjected tohydrogenation. Hydrogenated pyrolysis gasoline (HPG, hydrogenated pygas) is a common feedstock ofBTX plants forbenzene andtoluene extraction.[3]
{{cite web}}: CS1 maint: multiple names: authors list (link)